Abstract
This paper examines the influence of teacher’s mathematics pedagogical content knowledge (MPCK) in the teaching of area and perimeter to Grade 4 pupils. Lessons of a beginning teacher were studied to determine the activities and teaching strategies used to bring out ideas associated with area and perimeter. Observable MPCK-in-action outcomes are also being studied through video-taping the beginning teacher. In addition, this paper also studies how concept of area and perimeter is developed in class. The complex interplay between area and perimeter concepts was sometimes handled well by the beginning teacher, whereas on other occasions, gaps in mathematics pedagogical content knowledge had the potential to cause misconceptions for pupils.